import java.io.IOException;

@SuppressWarnings("all")
public class WW {
    WW ww;
    public String name = "jack";
    private int age = 18;
    public WW(){
        System.out.println("无参构造器  ww()");
    }
    public WW(String s){
        System.out.println("有参构造器  ww(String s)");
    }

    public static void main(String[] args) throws IOException { System.out.println("反射 main(String[] args)"); }
    public void hi(){  System.out.println("反射 hi()");  }

}